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The z/OS system linklist libraries contain many of the programs that make up the operating system environment. These programs include the linkage editor, an assembler-language processor, system utility programs, and service aid programs. Linklist libraries often contain data center applications programs.
The z/OS system linklist is a concatenation of several libraries that can be referenced collectively. The set of members named in the LNKLSTxx member of the logical parmlib identifies linklist libraries. The SYS1.LINKLIB data set is always specified first. It contains IBM-distributed programs, although it can also contain user programs. All other linklist libraries are handled as concatenations to SYS1.LINKLIB. Normally, the data center concatenates a number of applications program libraries to SYS1.LINKLIB. The data center has the option of making one or all of the libraries APF‑authorized.
Linklist libraries are important because most users can execute their contents. Therefore, you should review these libraries carefully to ensure that they do not contain any user-written programs with extraordinary powers.
The Linklist Library Display shows you the names of all linklist libraries, the DASD volume where each library resides, and the protect status of the libraries.
CA Auditor takes the information on the Linklist Library Display directly from z/OS system storage. Therefore, the list of libraries displayed represents the current list of libraries that form the system linklist. Compare this list to the LNKLSTxx members in the logical parmlib to ensure that they agree.
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